CN108404948A - A kind of (BiO)2CO3-BiO2-xComposite photo-catalyst and its preparation method and application - Google Patents
A kind of (BiO)2CO3-BiO2-xComposite photo-catalyst and its preparation method and application Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910000014 Bismuth subcarbonate Inorganic materials 0.000 claims abstract description 30
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims abstract description 12
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000002131 composite material Substances 0.000 claims description 37
- 239000002135 nanosheet Substances 0.000 claims description 16
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 11
- 239000002244 precipitate Substances 0.000 claims description 10
- 239000002057 nanoflower Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 230000000593 degrading effect Effects 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 239000002060 nanoflake Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 230000015556 catabolic process Effects 0.000 abstract description 10
- 238000006731 degradation reaction Methods 0.000 abstract description 10
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 2
- 239000013049 sediment Substances 0.000 abstract 2
- -1 and stirs 30min Chemical compound 0.000 abstract 1
- 229940106691 bisphenol a Drugs 0.000 abstract 1
- 235000019441 ethanol Nutrition 0.000 abstract 1
- 230000001699 photocatalysis Effects 0.000 description 18
- 239000000463 material Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 7
- 230000007062 hydrolysis Effects 0.000 description 6
- 238000006460 hydrolysis reaction Methods 0.000 description 6
- 238000001878 scanning electron micrograph Methods 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004626 scanning electron microscopy Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 230000032900 absorption of visible light Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/20—Carbon compounds
- B01J27/232—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a kind of (BiO)2CO3‑BiO2‑xThe preparation method of nano-photocatalyst belongs to light-catalysed technical field, is by NaBiO3·2H2O and a certain amount of g C3N4It is dissolved in deionized water, and stirs 30min, NaOH solution is then added and stirs 30min, 4~10h of hydro-thermal reaction is carried out at 180~200 DEG C, after reaction, cooling, filter out sediment, sediment is cleaned with deionized water and ethyl alcohol respectively, and drying is to get to (BiO)2CO3‑BiO2‑x, (BiO) prepared by the method for the present invention2CO3‑BiO2‑xNano-photocatalyst, compound BiO2‑xIt improves (BiO)2CO3Absorption to visible light, and inhibit light induced electron and hole at (BiO)2CO3It is compound, to improve (BiO)2CO3Visible light catalytic performance, especially to the degradation rate of bisphenol-A be higher than 70% or more, the degradation rate of Pyrogentisinic Acid reaches 50% or more.
Description
Technical Field
The invention belongs to the technical field of photocatalysis, and particularly relates to a (BiO)2CO3-BiO2-xA composite photocatalyst and a preparation method and application thereof.
Background
With the growing concern about water pollution in recent years, sewage treatment is the main research object at present. The photocatalysis technology is one of effective means for treating water pollution because of the characteristics of no toxicity of materials, strong oxidizing property and reducibility, no secondary pollution of products, capability of utilizing solar energy and the like. At present, among photocatalytic materials, TiO2The photocatalyst is the most red photocatalytic material in the world due to no toxicity, strong strengthening capability and stable chemical properties. Due to TiO2Can form electron and hole pairs only when irradiated by ultraviolet light, and the electron and the hole are easy to recombine due to the narrow forbidden band width, so that the photocatalytic activity is reduced, and TiO is hindered2Practical application of the photocatalytic material. Therefore, the development of new photocatalytic materials has become a major research direction. In the process of developing new photocatalytic materials, semiconductor materials have received extensive attention from researchers because of their unique photocatalytic properties.
In the research on semiconductor photocatalytic materials, bismuth-based semiconductor photocatalytic materials have been widely researched and developed due to their unique electronic structures, excellent light absorption capabilities and high photocatalytic performance. Wherein,(BiO)2CO3is most widely used. Chinese patent publication No. CN103084195B discloses a (BiO)2CO3The preparation method of the nano-sheet photocatalyst comprises the steps of dissolving a bismuth source in an acid solution, and adding ammonia water until a reaction solution is alkaline; then introducing CO into the obtained reaction mixture2Gas, reacting to obtain nano sheet (BiO)2CO3. But prepared by this method (BiO)2CO3Can not absorb visible light and has photocatalytic activity only under the irradiation of ultraviolet light. Chinese patent publication No. CN102671683B discloses a nano-sheet self-assembly C-doped (BiO)2CO3A preparation method of a microsphere visible-light-driven photocatalyst. C doped (BiO) prepared by the method2CO3The microsphere has certain photocatalytic activity under the irradiation of visible light. But in comparison to pure (BiO)2CO3C doping (BiO)2CO3The removal rate of the microspheres to NO is only 42.5%. Prepared by the above two methods (BiO)2CO3And C doping (BiO)2CO3Low visible light absorption rate, and easy recombination of photogenerated holes and photogenerated electrons on the surface of the material, so that (BiO)2CO3And C doping (BiO)2CO3The photocatalytic activity of (A) is low and the use is limited.
Disclosure of Invention
In order to overcome the prior art (BiO)2CO3The problem of lower photocatalytic activity under visible light conditions is to provide a (BiO) photocatalyst with strong absorption of visible light and high photocatalytic performance2CO3-BiO2-xA composite photocatalyst is provided. Also provides the (BiO)2CO3-BiO2-xA preparation method and application of the composite photocatalyst.
The technical scheme adopted by the invention is as follows:
one kind (BiO)2CO3-BiO2-xA composite photocatalyst, which is prepared by self-assemblyNano flower BiO2-xAnd nano flake (BiO)2CO3(ii) a composite material of (i) wherein x is 0.15 to 0.6, (BiO)2CO3The thickness of the nano-sheet is about 200-250 nm, and the thickness of the nano-sheet is BiO2-xThe particle size of the nanoflower is 100-500 nm.
Further defined, said (BiO)2CO3-BiO2-xThe specific surface area of the composite photocatalyst is 9-15 m2/g。
Above (BiO)2CO3-BiO2-xThe preparation method of the composite photocatalyst comprises the following steps:
mixing NaBiO3·2H2O and g-C3N4Dissolving in deionized water, stirring, adding NaOH solution, uniformly mixing, transferring the obtained mixed solution to a high-pressure hydrothermal kettle, carrying out hydrothermal reaction at 100-200 ℃ for 4-10 h, cooling after the hydrothermal reaction is finished, filtering out precipitate, cleaning the precipitate with deionized water and ethanol, and drying to obtain (BiO)2CO3-BiO2-xA composite photocatalyst is provided.
Further defined, the NaBiO3·2H2O and g-C3N4The mass ratio of (A) to (B) is 2.8: 1-4.2: 1.
further defined, the NaBiO3·2H2O and g-C3N4The mass ratio of (A) to (B) is 3.4: 1.
above (BiO)2CO3-BiO2-xThe composite photocatalyst is used for degrading bisphenol A and phenol.
Above (BiO)2CO3-BiO2-xThe specific method for degrading bisphenol A and phenol by using the composite photocatalyst is as follows: adding (BiO) of claim 1 to a solution of bisphenol A or phenol at room temperature2CO3-BiO2-xAnd irradiating the composite photocatalyst for 30-120 min under a visible light source.
Of the invention (BiO)2CO3-BiO2-xThe composite photocatalyst is synthesized by a hydrothermal method, and BiO is fully utilized2-xThe forbidden band width is 1.46eV, and the product has strong absorption property to visible light and near infrared light, and improves (BiO)2CO3-BiO2-xThe visible light absorption characteristic of the composite material enhances the visible light catalytic performance. At the same time, the nano flower-shaped BiO2-xIs increased (BiO)2CO3-BiO2-xSpecific surface area of the composite material, in favor of (BiO)2CO3-BiO2-xThe composite material adsorbs pollutants and increases the position of a catalytic activity reaction point, so that the photocatalytic performance of the composite material is improved, and particularly, the degradation rate of the composite material is more obvious for organic matters which are difficult to degrade by bisphenol A and phenol.
Drawings
FIG. 1 is an XRD pattern of the photocatalysts prepared in examples 1, 2 and 3 of the present invention;
FIG. 2 is an SEM image of a photocatalyst prepared in example 1 of the present invention;
FIG. 3 is a UV-vis DRS profile of a photocatalyst prepared in example 1 of the present invention;
FIG. 4 is an SEM image of a photocatalyst prepared in example 2 of the present invention;
FIG. 5 is an SEM image of a photocatalyst prepared in example 3 of the present invention;
FIG. 6 is a graph showing the degradation rate of the photocatalyst for bisphenol A provided in examples 1, 2 and 3 of the present invention.
FIG. 7 is a graph showing the degradation rate of phenol by the photocatalyst provided in examples 1, 2 and 3 of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and experiments.
Example 1
This example uses NaBiO3·2H2O and g-C3N4Is prepared from raw materials (BiO)2CO3-BiO2-xThe method for preparing the composite photocatalyst is realized by the following steps:
1.68g NaBiO3·2H2O and 0.6g g-C3N4(the mass ratio is 2.8:1) is dissolved in 40mL of deionized water, stirring is carried out for 30 minutes, NaOH solution is added, mixing is carried out, the obtained mixed solution is transferred to a high-pressure hydrothermal kettle, hydrothermal reaction is carried out at 180-200 ℃, the reaction time is 4-10 hours, after the hydrothermal reaction is finished, cooling is carried out, precipitates are filtered out, the precipitates are washed by the deionized water and ethanol, and drying is carried out, thus obtaining (BiO)2CO3-BiO2-xA composite photocatalyst, x ═ 0.15 to 0.6, (BiO for short)2CO3-BiO2-x-2.8)。
Will be obtained by the invention (BiO)2CO3-BiO2-xXRD analysis of the nano-photocatalyst showed that the result is shown in FIG. 1, and FIG. 1 shows that (BiO) is provided in example 1 of the present invention2CO3-BiO2-xThe XRD pattern of the nano-photocatalyst can be seen from FIG. 1 that the phase of the photocatalyst prepared in example 1 is (BiO)2CO3And BiO2-x。
Will be obtained by the invention (BiO)2CO3-BiO2-xSEM analysis of the photocatalyst is shown in FIG. 2, and FIG. 2 shows the result of (BiO) prepared in example 1 of the present invention2CO3-BiO2-xSEM image of photocatalyst, as can be seen from FIG. 2, (BiO) prepared in this example2CO3-BiO2-xThe photocatalyst is a nanoflower BiO formed by self-assembling nano sheets2-xAnd nano flake (BiO)2CO3Composition (BiO)2CO3The thickness of the nano-sheet is about 200-250 nm, and the thickness of the nano-sheet is BiO2-xThe particle size of the nanoflower is 100-500 nm.
Will be obtained by the invention (BiO)2CO3-BiO2-xSpecific surface area test of nano photocatalyst (Belsorp max full-automatic N)2Desorption apparatus), known (BiO)2CO3-BiO2-xThe specific surface area of the composite photocatalyst is 9-15 m2/g。
Obtained (BiO)2CO3-BiO2-xThe UV-vis DRS analysis of the photocatalyst is shown in FIG. 3, and FIG. 3 shows the (BiO) prepared in example 1 of the present invention2CO3-BiO2-xUV-vis DRS spectra of the photocatalyst, the results show that the photocatalyst is pure (BiO)2CO3In contrast, due to BiO2-xCombined action, prepared in this example (BiO)2CO3-BiO2-xHas great absorption to visible light.
Example 2
This example uses NaBiO3·2H2O and g-C3N4Is prepared from raw materials (BiO)2CO3-BiO2-xThe method for preparing the composite photocatalyst is realized by the following steps:
1.68g NaBiO3·2H2O and 0.49g g-C3N4(the mass ratio is 3.4:1) is dissolved in 40mL of deionized water, stirring is carried out for 30 minutes, NaOH solution is added, mixing is carried out, the obtained mixed solution is transferred to a high-pressure hydrothermal kettle, hydrothermal reaction is carried out at the temperature of 100-150 ℃, the reaction time is 4-10 hours, after the hydrothermal reaction is finished, cooling is carried out, precipitates are filtered out, the precipitates are washed by the deionized water and ethanol, and drying is carried out, thus obtaining (BiO)2CO3-BiO2-xA composite photocatalyst, x ═ 0.15 to 0.6, (BiO for short)2CO3-BiO2-x-3.4)。
Will be obtained by the invention (BiO)2CO3-BiO2-xSEM analysis of the photocatalyst is shown in FIG. 4, and FIG. 4 shows the result of (BiO) prepared in example 1 of the present invention2CO3-BiO2-xSEM image of photocatalyst, as can be seen from FIG. 4, (BiO) prepared in this example2CO3-BiO2-xThe photocatalyst is a nanoflower BiO formed by self-assembling nano sheets2-xAnd nano flake (BiO)2CO3Composition (BiO)2CO3The thickness of the nano-sheet is about 200-250 nm, and the thickness of the nano-sheet is BiO2-xThe particle size of the nanoflower is 100-500 nm.
Example 3
1.68g NaBiO3·2H2O and 0.4g g-C3N4(the mass ratio is 4.2:1) is dissolved in 40mL of deionized water, stirring is carried out for 30 minutes, NaOH solution is added, mixing is carried out, the obtained mixed solution is transferred to a high-pressure hydrothermal kettle, hydrothermal reaction is carried out at the temperature of 100-200 ℃, the reaction time is 4-10 hours, after the hydrothermal reaction is finished, cooling is carried out, precipitates are filtered out, the precipitates are washed by the deionized water and ethanol, and drying is carried out, thus obtaining (BiO)2CO3-BiO2-xA composite photocatalyst, x ═ 0.15 to 0.6, (BiO for short)2CO3-BiO2-x-4.2)。
Will be obtained by the invention (BiO)2CO3-BiO2-xSEM analysis of the photocatalyst is shown in FIG. 5, and FIG. 5 shows the result of (BiO) prepared in example 1 of the present invention2CO3-BiO2-xSEM image of photocatalyst, as can be seen from FIG. 5, (BiO) prepared in this example2CO3-BiO2-xThe photocatalyst is a nanoflower BiO formed by self-assembling nano sheets2-xAnd nano flake (BiO)2CO3Composition (BiO)2CO3The thickness of the nano-sheet is about 200-250 nm, and the thickness of the nano-sheet is BiO2-xThe particle size of the nanoflower is 100-500 nm.
(BiO) obtained in examples 1 to 32CO3-BiO2-xThe catalytic performance of the composite photocatalyst is tested, and the method specifically comprises the following steps:
the (BiO) from each example was mixed at room temperature2CO3-BiO2-xAdding the composite photocatalyst into a bisphenol A solution, irradiating for 50 minutes by visible light, and detecting the degradation rate of the catalyst on bisphenol A.
The (BiO) from each example was mixed at room temperature2CO3-BiO2-xAdding the composite photocatalyst into a phenol solution, irradiating for 120 minutes by visible light, and detecting the degradation rate of the catalyst on phenol.
The results are shown in FIGS. 6 and 7, respectively, and FIG. 6 shows the product and pure (BiO) of each example of the present invention2CO3The results of the degradation rate comparison of bisphenol A are shown in FIG. 7, which shows the product of each example of the present invention and pure (BiO)2CO3The degradation rate of phenol is plotted.
As is clear from fig. 6 and 7, the rate of hydrolysis of bisphenol a by the product obtained in example 1 was 75%, the rate of hydrolysis of phenol was 50%, the rate of hydrolysis of bisphenol a by the product obtained in example 2 was 72%, the rate of hydrolysis of phenol was 43%, the rate of hydrolysis of bisphenol a by the product obtained in example 3 was 71%, and the rate of hydrolysis of phenol was 40%. Thus, the (BiO) prepared by the present invention2CO3-BiO2-xPhotocatalyst is compared with pure (BiO)2CO3Has high visible light catalytic activity, can be used for degrading bisphenol A and phenol, and is compared with pure (BiO)2CO3The degradation rate of the catalyst is higher.
Claims (7)
1. One kind (BiO)2CO3-BiO2-xThe composite photocatalyst is characterized in that: the catalyst is a self-assembled nano-flower BiO2-xAnd nano flake (BiO)2CO3(ii) a composite material of (i) wherein x is 0.15 to 0.6, (BiO)2CO3The thickness of the nano-sheet is about 200-250 nm, and the thickness of the nano-sheet is BiO2-xThe particle size of the nanoflower is 100-500 nm.
2. The (BiO) according to claim 12CO3-BiO2-xThe composite photocatalyst is characterized in that: the (BiO)2CO3-BiO2-xThe specific surface area of the composite photocatalyst is 9-15 m2/g。
3. A (BiO) according to claim 12CO3-BiO2-xThe preparation method of the composite photocatalyst is characterized by comprising the following steps:
mixing NaBiO3·2H2O and g-C3N4Dissolving in deionized water, stirring, adding NaOH solution, uniformly mixing, transferring the obtained mixed solution to a high-pressure hydrothermal kettle, carrying out hydrothermal reaction at 100-200 ℃ for 4-10 h, cooling after the hydrothermal reaction is finished, filtering out precipitate, cleaning the precipitate with deionized water and ethanol, and drying to obtain (BiO)2CO3-BiO2-xA composite photocatalyst is provided.
4. The (BiO) according to claim 32CO3-BiO2-xThe preparation method of the composite photocatalyst is characterized in that the NaBiO3·2H2O and g-C3N4The mass ratio of (A) to (B) is 2.8: 1-4.2: 1.
5. the (BiO) according to claim 32CO3-BiO2-xThe preparation method of the composite photocatalyst is characterized in that the NaBiO3·2H2O and g-C3N4The mass ratio of (A) to (B) is 3.4: 1.
6. the (BiO) of claim 12CO3-BiO2-xThe composite photocatalyst is used for degrading bisphenol A and phenol.
7. The (BiO) of claim 62CO3-BiO2-xThe specific method for degrading bisphenol A and phenol by using the composite photocatalyst is as follows: dissolving in bisphenol A or phenol at room temperatureAdding (BiO) of claim 1 to the solution2CO3-BiO2-xAnd irradiating the composite photocatalyst for 30-120 min under a visible light source.
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| CN109482171B (en) * | 2018-12-29 | 2021-03-09 | 陕西师范大学 | Bi/beta-Bi2O3Nanometer flower ball shaped photocatalyst and preparation method thereof |
| CN111701583A (en) * | 2020-07-27 | 2020-09-25 | 齐鲁理工学院 | Ultrathin hexagonal BiO2-x platelet photocatalyst and preparation method thereof |
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